摘要:

Overhung boring bars of 10 to one overhang in the region of 38 mm diameter generally give rise to problems of poor surface finish and geometric form. The present work develops and extends that of Hahn (1951) and shows how improvements in performance may be obtained by modifying the construction of the boring bar. and choosing the optimum clearance fur a damper slug. The theory of the dynamic response of the damped bar is developed and an explanation is given of how the mechanism of damper behaviour changes as resonance is approached so that impacting is combined with viscous damping. The result of this combination, apparently, is to improve performance.

ISSN:0020-7543    

DOI:10.1080/00207547608956591

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Free-machining additions have been added to ferrous and non-ferrous materials for many years. One explanation of their effect in machining is that they reduce the effective interfacial shear strength between chip and tool.

ISSN:0020-7543    

DOI:10.1080/00207547608956592

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

In the past the torsion test has been used in an attempt to correlate the deformation in metal forming and cutting operations with data obtained from a simple materials test. The success of these attempts has been variable.

ISSN:0020-7543    

DOI:10.1080/00207547608956593

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

A mathematical model of production planning for a multiproduct, multistage produetionaystom (production equation, transition equation and objective function) was constructed in order to derive the optimal decision rule to be adapted to demand fluctuation. With this model the optimal solution and the computational algorithm were determined by functional space approach. With use of this algorithm, a numerical example of optimal production planning was solved.

ISSN:0020-7543    

DOI:10.1080/00207547608956594

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Of utmost importance to the firm is the achievement of the most efficient utilization of its available resources while adhering to the restrictions of its economic environment. One of the inherent difficulties with present linear programming formulations of the coordinated production and logisties planning problem is the failure to include the multiple goals intrinsic to the planning of the firm. The model to be presented in this paper will consider three commonly occurring goals of the firm in coordinating production and logistics planning. These are (1) the maximization of total sales revenue for a specific location and customer; (2) the minimization of total production and distribution costs; and finally, (3) the maximization of production for a particular item at a particular location. This model structure will also include capacity, budget, demand and volume constraints for each production facility. The solution technique for this model will be a computerized multiple objective analogue of the revised simplex method.

ISSN:0020-7543    

DOI:10.1080/00207547608956595

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Much of job-shop scheduling research is based on the assumption that due dates are outside the control of the scheduler. The paper examines several procedures for specifying due dates, largely dependent on the expected processing time for jobs and on the level of congestion in the shop.

ISSN:0020-7543    

DOI:10.1080/00207547608956596

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

In this paper a new approach to short-term workshop scheduling problema is presented. The situations treated are dynamical rather than static. The approach does not use a mathematical-programming point of view of the operations research, Instead, it is an ‘ automatic-control ’ or ‘ system-theory ’ approach. The system studied is the finishing workshop of some cloth industry. The spocific situation of this workshop is the high amount of perturbations (20%) which renders normal scheduling inefficient. The suggested solution is the use of a regulating scheme, which operates on the basis of an adaptive model simulating the operating conditions of the workshop. In the first part of the paper, the system is described and the problem formulated. In the second part, the constitution of the simulation model is presented and results for its validation given. Finally, the regulating method is discussed and computer operating results are shown.

ISSN:0020-7543    

DOI:10.1080/00207547608956597

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

A two-stage production line which is both balanced and unbalanced is investigated, where the service times at each station and the interarrival times to the system are independently and normally distributed. Computer simulation is employed in producing interdeparture times of the first station, expected time in the system per arrival and expected queue sizes.

ISSN:0020-7543    

DOI:10.1080/00207547608956598

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The facilities design problem involves the constrained assignment ofnfacilities tonlocations in such a way that the total cost of the design is minimized. Alln!feasible solutions for a given problem yield a finite frequency distribution of total costs between absolute lower and upper bounds. The distribution possesses an easily calculable and absolute mean and may often be adequately described by the normal distribution as well as the gamma and Weibull distributions.

ISSN:0020-7543    

DOI:10.1080/00207547608956599

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The scheduling of jobs on machines in a job-shop is considered using a multilevel decision-making structure. The levels are coordinated by considering as constraints on one level the decision made on the preceding level. For job-shop scheduling a tool is proposed to enable one to find and to analyse the set of feasible schedules in the light of the decision taken on the previous level. The information obtained as to the earliest starting and latest finishing times for performing the operations, as well as the logical sequence constraints acts as decision aids for the scheduling of the operations. The decision is made by choosing, from amongst the actions which are possible in the light of the overall objective, an action which takes into account secondary elements and considerations particular to the job-shop.

ISSN:0020-7543    

DOI:10.1080/00207547608956600

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor